Shell Ireland says it is seriously concerned by the threat posed to its staff and the general public after a 'viable' explosive device was found at its Dublin office.
The device, found last night outside the company's headquarters at Corrib House on Lower Leeson Street, was made safe by army bomb disposal experts.
It was found at around 10pm and has been described by gardaí as 'viable'.
Gardaí removed a number of items from the scene and have begun an investigation.
A Shell E&P Ireland spokesman described the incident as a 'sinister development'.
'The work currently being undertaken on the Corrib project has all the necessary consents and permissions required by the various statutory bodies which oversee the project', the spokesman says in a statement.
'We remain open and willing to talk to any individuals or groups who continue to have concerns about our project.'
The Shell to Sea campaign has denied any links with the device, saying its members are committed to peaceful public protest.
One of the group's campaigners, Maura Harrington, is currently on the eighth day of a hunger strike which she began when Shell's pipe-laying ship arrived in Broadhaven Bay, Co Mayo.
